apache spark JAVA将Tuple2的数据集转换为字符串

Question

我有这个数据集

DataSet<Tuple2<String, Integer>> counts =
                // split up the lines in pairs (2-tuples) containing: (word,1)
                text.flatMap(new LineSplitter())
                // group by the tuple field "0" and sum up tuple field "1"
                .groupBy(0)
                .sum(1);

counts.print();

返回

(some,3)
(text,1)
(here,1)

我想在API响应中以字符串的形式返回它，但我尝试的一切都不起作用